"""
基金资产模块 - 定义基金资产类及其特有功能
"""

from typing import Dict, List, Union, Any, Optional
import pandas as pd
from datetime import datetime, timedelta

from FDAS.data.assets.base import Asset
from FDAS.data.constants import ASSET_TYPE_FUND
from FDAS.core.exceptions import DataFetchError

class Fund(Asset):
    """
    基金资产类
    
    提供基金特有的数据获取和分析功能
    """
    
    @property
    def asset_type(self) -> str:
        """获取资产类型"""
        return ASSET_TYPE_FUND
    
    def _get_basic_info(self) -> Dict:
        """获取基金基本信息"""
        try:
            return self.provider.get_fund_basic_info(self.symbol)
        except Exception as e:
            return {
                "code": self.symbol,
                "name": "未知基金",
                "asset_type": self.asset_type,
                "error": str(e)
            }
    
    def get_history(self, 
                   start_date: Optional[str] = None, 
                   end_date: Optional[str] = None,
                   period: str = "daily", 
                   adjust: str = "",
                   limit: Optional[int] = None) -> pd.DataFrame:
        """获取基金历史行情数据"""
        try:
            # 设置默认日期
            if not end_date:
                end_date = datetime.now().strftime("%Y%m%d")
            if not start_date:
                start_date = (datetime.now() - timedelta(days=365)).strftime("%Y%m%d")
            
            # 获取历史数据
            df = self.provider.get_asset_history(
                symbol=self.symbol,
                asset_type=self.asset_type,
                period=period,
                start_date=start_date,
                end_date=end_date
            )
            
            # 限制数据条数
            if limit and len(df) > limit:
                df = df.tail(limit)
                
            return df
        except Exception as e:
            raise DataFetchError(f"获取基金历史数据失败: {str(e)}")
    
    def get_nav(self, 
               start_date: Optional[str] = None, 
               end_date: Optional[str] = None) -> pd.DataFrame:
        """获取基金净值数据"""
        try:
            # 设置默认日期
            if not end_date:
                end_date = datetime.now().strftime("%Y%m%d")
            if not start_date:
                start_date = (datetime.now() - timedelta(days=365)).strftime("%Y%m%d")
            
            return self.provider.get_fund_nav(
                symbol=self.symbol,
                start_date=start_date,
                end_date=end_date
            )
        except Exception as e:
            raise DataFetchError(f"获取基金净值数据失败: {str(e)}")
    
    def get_portfolio(self) -> Dict:
        """获取基金持仓数据"""
        try:
            return self.provider.get_fund_portfolio(self.symbol)
        except Exception as e:
            raise DataFetchError(f"获取基金持仓数据失败: {str(e)}")
    
    def get_performance(self) -> Dict:
        """获取基金业绩数据"""
        try:
            # 这里需要实现基金业绩数据获取逻辑
            # 可能包括年化收益率、最大回撤、夏普比率等
            return {
                "annual_return": 0.0,
                "max_drawdown": 0.0,
                "sharpe_ratio": 0.0,
                "volatility": 0.0
            }
        except Exception as e:
            raise DataFetchError(f"获取基金业绩数据失败: {str(e)}")